Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a9f9e5b5a88679…

MALICIOUS

PDF

51.0 KB Created: 2020-11-02 19:08:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5ae6981e671dda8405b1bebd0e26fc97 SHA-1: 5b63356f3d579e7289cbef1664e57dc9ec06d72a SHA-256: a3a9f9e5b5a88679306057ca060674e01b5c9c8992183525a2502928a886e566
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/123?keyword=paper+tuning+a+bowtech In PDF document text
    • https://jovofodofipepij.weebly.com/uploads/1/3/2/6/132682866/guxowibo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369162/normal_5f891dfe55c3f.pdfIn PDF document text
    • https://sasakafu.weebly.com/uploads/1/3/4/3/134371045/xivuvoju.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/3006570.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/5648329.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fibaxizimudez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3324/5854/files/official_curriculum_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9901/1237/files/merrit_athletic_club_eldersburg.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/axinterop._acropdflib._dll_64_bit_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7943/2347/files/bulk_flip_flops.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dafa24f4-3ff5-4569-84a8-56051544378c/xudikovotevumanesisaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33ef3014-501b-42b7-9aa0-ff5cf4728736/what_is_standard_openhcd_usb_host_controller.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/low_sodium_cottage_cheese_trader_joes.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/zeveligojuge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7234/8870/files/lojavewiwebotifebu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7919 5100 bytes
SHA-256: 8215e64cfc82865fbb6001fc9dfb3c4b0fe4aaf6c41fc91cb6e5e911d674ea58
font_01_sfnt_off00008a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A75 11280 bytes
SHA-256: 4d40bd6c41255975df2f25b6a8b348279369a099981cd3718804128d3eeded85
font_02_sfnt_off0000b0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C3 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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